Hey Folks,
Re-did the J Valve video with a more accurate portrayal of how a J valve works (thanks Captain) Has shots of SP "Pilot" test as well.
Sorry for the typos on this video and the previous one. I'll eventually re-submit both. Its spelled STRANGE dummy, not stange.
I think my R is going out on my 5 year old computer.
https://www.youtube.com/watch?v=U0_A0jsqyZs